aseceoft



2 Sheets-Sheet 1..

(No Model.)

J. ASHCROFT.

PURNACE POP. STEAM BUILBRS.

Patented Jan. 25, 1887.

Tlf

ni 11 ...mM-Vl WITJV'ESSES 2 Sheets- Sheet 2.

(No Model.)

J. ASHGROFT. FURNAGE POR STEAM BOILERS.

Patented Jan. 25, 18787,

Fsjy.

` Nrrsn STATES Partnr trice.'

JOHN ASIOROFT, OF NEW YORK, N. Y.

FU RNACE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 356,675, dated January25, 18,87.

Application iiled May Q9, 1386. Serial No. 203,625. (No model.)

To all lah-0122. it may con/cern.-

Beit known that l, JOHN Asnonoir'r, a citizen of the UnitedStatearesiding at New York, in the county of New Yori; and State of NewYork, have invented certain new and useful Improvements in Furnaces forSteam-Boilers, of which the following is a specification, referencebeing had therein to the accompanying drawings.

My invention relates to improvements in grates for the furnaces ofsteam-boilers, the object of which is to utilize the heat of the furnace for heating the water before it enters the boiler.

My invention consists of the alternate arrangement of hollow water barswith solid movable bars of the grate, said solid bars being adapted tobe revolved, as will more fully appear.

My invention consists, further, in certain details of construction,which will be fully described hereinafter, and pointed out in the claim.

Figure l is a longitudinal vertical sectional view of the furnace andone of the water-bars. Fig. 2 is a horizontal sectional view of thei`urnace on the line o; c of Fig. 1. Fig. 3 isasectional end view of thesame on the line y g1 of Fig. 2. Fig. l is a top or plan view ofamodification. is a horizontal sectional view, ou an enlarged scale, ofthe water-tubes and water boi: or back. Fig. 6 isa sectional view on theline e ofFig. 5.

Referring to drawings, A designates the side wall of the furnace; B, thebridge-wall; C, the front wall with openings D for the furnacedoors andlike openings, E, to the ash-pit.

F are bearingbars, arranged at suitable dis tances apart for the supportof the gratebars, said bearing-bars being provided with notches c, toreceive the grate-bars and prevent them from being laterally displacedwhile being shaken or revolved to free the lire of clinkers or ashes.

, G are solid grate-bars supported on the bearingbars F, said barsbeing, by preference, of

' triangular shape in cross-section, as this form of bar is superior toall others in that it lasts longer and is easily turned in its bearings,while the angular portionsserve to cut or break the olinlrer whichinayhave formed in the furnace. This forni of bar was patented to nieNovember 27', 1877, No. 197,5l0, and need not be more fully described inthis connection.

H are hollow or water grate-bars,whieh, by preference, are made oi'heavy wrought-iron pipe or tubing, the front ends of which are closed byscrew-caps Lwhile the rear ends are connected to and communicate withthe hotwater chamber K of the water-back L, and by providing the hollowbars H with screw-caps I am enabled to have ready access to the interiorof said bars and to the water-back, to clean the same from dirt orscales when required. These hollow bars are arranged alternately betweenthe solid triangular bars G, and are pro vided with small open-endedtubes M, located therein, said tubes M being connected to andcommunicating with the cold-water chamber N of the water-back L.

Lis the water inlet and outlet chamber, lo cated in the bridgewall B ofthe furnace, and consists of a cast-iron rectangular, box divided intotwo longitudinal compartments, K and N, by the partition O. The chamberor compartment N is connected to a suitable cold-water supply tank bymeans of the pipe P, while the chamber K is connected to the boiler bymeans of the pipe R.

In Fig. 8 I have shown a modification in which the water-bars arecomposed of a con.- tinuous tube, S, said tube being bent at the ends ofthe furnace and brought back and forth between the solid grate-bars, asshown. In this case the coid water can be passed in at either end of thepipe, but preferably at the end T, and after passing through the entirelength of the pipe it is discharged into the boiler through the end V.

It will be noticed that in both of the constructions shown the solidgrate-bars alternate with the tubular or water bars, and that by aslight shaking or rocking of the bars the entire surface of the grate,which includes the water-bars, is kept free from elinkers and ashes,While the water in its passage through the hollow bars is heated andpumped into the boiler. The solid bars G are provided with pinion-wheelsA', which mesh with each other, one of said bars being provided with anarm or lever, B", by means of which the barsG for the circulationtherethrough of Water, and i can be rotated to free the grate of ashesand a series of solid bars arranged alternately clinkers. with the Water-barsf said solid bars being 15 This construction or arrangement isespeadapted to be revolved or shaken, as and for 5 eially desirable forlocomotive-engines, as it the purpose set forth.

enables the fireman to keep his fires Clean with In testimonywhereofaffix my signature in buftrvery little exertion. presence of twowitnesses.

avin thus described In invention, what i l claim, eid desire to securegy Letters Patent, JOHN ASHCROFT' 1o 1s- Witnesses:

In a furnace for steani-boilers, the grate YV. J. G. BEARNS, which iscomposed of a series of holler bars AUGUST FIsCHER.

